I only bought it about 3 weeks ago. = I bought it 3 weeks ago, which is a very short time ago

Have you got the receipt with you? = Do you have the receipt with you now?

the receipt = the slip of paper given when you buy something

I’ve brought it with me = I have brought it to this place today (note: we never actually say it like this!)

I’ve left it at home = it is still at home, because I have forgotten to bring it(note: you can learn the grammar of ‘remember’ and ‘forget’ in the audio word study in my blog at https://www.dailystep.com/en/blog/remember-and-forget-gerund-or-infinitive)

at home = in my house

I won’t be able to replace it = it will not be possible for me to replace it (more formal)

to replace it = to give you another one instead of this one

unless you show me = if you don’t show me

I’ll go home and get it = I will go to my house and fetch it (more formal)

I only bought it about 3 weeks ago. = I bought it 3 weeks ago, which is a very short time ago

Have you got the receipt with you? = Do you have the receipt with you now?

the receipt = the slip of paper given when you buy something

I’ve brought it with me = I have brought it to this place today (note: we never actually say it like this!)

I’ve left it at home = it is still at home, because I have forgotten to bring it (note: you can learn the grammar of ‘remember’ and ‘forget’ in the audio word study in my blog at https://www.dailystep.com/en/blog/remember-and-forget-gerund-or-infinitive)

at home = in my house

I won’t be able to replace it = it will not be possible for me to replace it (more formal)

to replace it = to give you another one instead of this one

unless you show me = if you don’t show me

I’ll go home and get it = I will go to my house and fetch it (more formal)